Echinoidea - Clypeasteroida - Echinarachniidae
Full reference: J. Lambert and P. Thiéry. 1914. Essai de nomenclature Raisonnée des échinides. L. Ferrière, Chaumont (4)241-320
Parent taxon: Scutelliformes according to A. Kroh and A. B. Smith 2010
See also Durham 1955, Durham 1966, Hall 1962 and Linder et al. 1988
Sister taxa: Abertellidae, Astriclypeidae, Dendrasteridae, Eoscutellidae, Mellitidae, Monophorasteridae, Placatenellidae, Protoscutellidae, Rotulidae, Scutasteridae, Scutellidae, Taiwanasteridae
Subtaxa: Astrodapsis Echinarachnius Kewia Nipponaster Pseudoastrodapsis Remondella Tenuirachnius Vaquerosella
Ecology: slow-moving semi-infaunal detritivore
Distribution:
• Quaternary of United States (1: Alaska collection)
• Pliocene of Mexico (1), Taiwan (1), United States (15: Alaska, California, Oregon)
• Miocene to Pliocene of United States (1: California)
• Miocene of Mexico (2), United States (122: Alaska, California, New Jersey)
• Oligocene of Canada (1: British Columbia), Mexico (1), United States (5: California, Oregon)
• Cenozoic of United States (1: Alaska)
Total: 151 collections including 192 occurrences